Lifting jack



Aug. 23, 1932. M. B. LUCKER LIFTING JACK Filed Kay 16, 1928 C/ lllllllll Patented Aug. 23, 1932 stares PATENT ortica Y MLLARD B. L-UACKEE, OF BENTON`HASRBOR, Ill/[IGH:[(rAN, ASSIGNOR, 'BY MESNE ASSIGN- MENTS, TO TEE DAYTON MALLEABLE IRON COMPANY, OF DAYTON, OHIO, A. CORPO- tratedand described in my above mentioned BATION OF OHIO Application led May 16,

My invention relates in general to lifting jacks and more particularly to a jack of the double lift type, that is to say, a ack having a frame and aftwo-piece lifting member arranged in telescopic relationship. The main `feature of jacks of this general type is' that a jack having a low initial or collapsed height to accommodate the low front axle of modern automobile construction, especially when the tire is deflated, may be extended through a lifting range sufficient to accommodate the relatively high rear axle of the modern auto* mobile especially when the tire is inflated, that is to say, the main vfeature of jacks of this type is the high ratio of fullyv extended l height to collapsed height. y

Such a jack is illustrated in my co-pending applications, Serial Number 242,697, filed December 27, 1927, and Serial Number 252,-V

"` O89, filed February 26, 1928, and my present invention. contemplates the kprovision of a jack in which the .double lift principle is embodied in a simpler, more rugged and more satisfactory construction than those illusapplications.A p

@ne of the important objects of my present invention is to provide, in Va double lift Jack,

simple and positive means for preventing the f rotation of the outer lifting member as it is ber may, be counteracted.

`Still another important object of my pres`v ent invention is to provide in a lifting jack, a friction Vdevice of simple, rugged construe! tien and positive. action for preventing the relative rotation of an extensible member withinajack frame.

Numerous other objects and advantages of the invention will be apparent as it is more fully understood from rthe following description which, taken in connection with the ac- Abeveledgear 21 having Lrrrnvaaaox 192s. serial no. 278,267. y

companying drawing, discloses a? preferred embodiment ofthe invention.

Referring to the drawing: Figure 1 is a vertical cross-section taken through a jack embodying my present invention ;A i

1 Figure2 is a side elevation taken from the right in Figure v1V and showing the jack in partially and fully extended position Figure 3 is a horizontal crossjsection taken substantially along the line See-3 in Figure 1; and

Figure t is a horiZontalcross-section taken substantially along the line 1 -4 in Figure 1.

To illustrate my invention I have shown on the drawing a preferred embodiment of vmy, invention comprising an integral support frame having a base 11 and a cylindrical sleeve 13 extending upwardly of the base. A bearing support 15 is arranged at the upper end ofthe cyli-ndricalsleeve and has an upper portion extending th'ereover and carrying a bearing 17aligned centrally over the upper end of the sleeve 13,' strengthening webs 19 bei-ng arranged at the junction of the parts.

a hub 23 is rotatably mounted in the bearing 17 with its toothed periphery 25 extending outwardly to engage a co-operating driving pinion 27 carried on a stub shaft 29 journaledrin a bearing 31 formed in the bearing support 15. End-play of the stub shaft is prevented by means of aV shoulder .33 formed on the pinion. The stub shaft extends through the bearing and is provided with a collar having a central socket which, in` the illustrated embodiment, is square in cross-section. This socket is to aocommodate the squared end of an operating handle (not shown) by which the rotation of' the pinion and the gear may be accomplished at a distance from the jack. The sleeve13 provides a cylindrical channel 37' extending through the base to the upper end of the sleeve which isV furnished to provide a. bearing seat 39. The lower end of the bearing 17 andthe bearing seat 39 are spaced apart sufficiently to allow the beveled gear 21 to be slid edgewise therebetween in order to place it in position to be arranged in the bearing 17, the hub 23 thereof sliding upwardly into place A forming, when in position, a continuation thereof. In the illustrated embodiment the `extensible or lifting members comprise an Vinner shaft having external threads 47 extending. throughout its length, and an outer sleeve 49 having an internally threaded portion 53 at its upper end and provided with external screw threads 51 throughout its entire length. The threads 51 are adapted to co-operate with internal screw threads 57 formed inthe bore of 4the gear 21 so that upon rotation of the gear, the tubular extensible member 49 may be moved axially in the frame. The internal threads 53 are adapted to co-operatively engage the external threads 47 on the inner extensible member 45 so that upon rotation of the outer extensible member, the inner member. being held against rotation, the latter Y will be easily extended with respect to the former. A stop or peg 59 is set in the groove of the threads 47 at adjacent the lower end of the inner extensible member 45 to enga-ge the lower end of the threaded portion 53 when the inner member is in extended position to limit the relative axial movement thereof with respect to the outer extensible member 49. The inner member 45 is rst assembled through the lower end of the outer sleeve member 49 by engaging the threads 47 and 5.3. After the shaft is thus assembled the sleeve 49 and shaft 45 are together inserted in the sleeve 13 through the lower open end thereof by sliding them longitudinally through the channel 37 and through the opening 43 in the roller bearing. The external threads 51 of the outer extensible member 49 are then mated with the internal threads 37 of the operating member or gear 21. After the members are thus arranged, a peg 61 is set in the groove of the threads 51 and adjacent the upper end of the extensible member 49 which peg, by engaging the upper surface of the gear 21, limits the downward axial motion ofthe extensible member 49. A load-carrying head 63 is finally rigidly secured'to the upper end of the inner extensible member 45.

Upon rotation of the gear 21, the extensible elements 49 and 45. being in the collapsed position illustrated in Figure 1, the outer or tubular extensible member 49 will be raised by the co-operation of the threaded portions 57 of the gear and 51 of the extensible member, provided that the extensible member is prevented from rotating within the frame.

interlocking Connection in a grooved portion 73 of the tubular member 13. This friction device comprises a collar 65 having a central opening 67 adapted to loosely lit over the lower end 69 of the outer extensible member '49,which is peened over as at 71, after the collar'has been arranged on the end of the extensible member to keep the same in position. The collar is provided with outstanding ears which are adapted to engage in a slot 77 formed in the longitudinally ridged portion 73 of the tubular frame portion 13. The collar is provided with circular apertures 79 diametrically disposed therein and in which the ends of spring members 81 are adapted to engage. These spring members are arranged to frictionally engage the lower` end of the extensible member 49 and to prevent relative rotation of the collar 65 about the extensible member. The slot 77 formed in the tubular upright portion of the frame extendsthroughout the length of the channel 37 so that no matter what position the extensible member 49 may assume in the sleeve, the friction device will always interlockingly engage the frame to resiliently prevent relative rotation of the extensible member therein.

Operation Upon rotation of the gear 21 the extensible member 49 is raised from collapsed position within the cylindrical channel 37 by the cooperation of the threads 51 and 57, the frictional `connection between the extensible member 49 and the frame, by means of the springs 81 and the collar 65, preventing the rotation of the former with respect to the latter. When the outer extensible member 49 arrives at the position illustrated in Figure 2 of the drawing, a peg 83 which is set in the groove of the threads 51 at a point spaced from the lowergend of the tube, engages the lower edge of the gear and provides a positive driving connection between the gear and the extensible member whereby the member 49 is rotated in spite of the frictional resistance furnished by the springs 81 and collar 65. Upon rotation of the outer extensible member 49, a load being supported upon the head 63 and preventing its rotation, the shaft 45 is projected upwardly through the tube by the co-operation of the threads 47 and until the fully extendedv jack position illustrated in dotted lines in Figure 2 of the drawing is reached, at which point the peg 59 arranged at the lover end of the extensible member 45, engages the lower end of the threaded portion 53 of the outer extensible member and prevents further extension in an upward direction of the inner extensible member 45. By reversing the rotation ofthe gear 2l, the outer extensible member is first withdrawn into the sleeve until the pin 6l at the upper end thereof engages the upper end of the gear, whereupon the inner extensible member is retracted within the outer memy ber 49 until the load-carrying head' engages the upper end of themember 49 in which position the jaclr is in fully collapsed condition.

It will :be readily seen from the `foregoing that the gear Ql'provides an voperating member comprising an internally threaded collarl rotatably mounted in the frame and having threaded engagement with the outer exten# sible member. The novel friction device com.- prising the collar and the springs 8l, by engagement of its outstanding ears in the groove 77 of the tubular frame portion 13, prevents the member 49 from rotating in the frame and allows the gear to raise and lower the extensible member in the frame. The pegs 6l and 83 act not only tolimit the axial movement of the extensible member with respect to the frame,.but also provide a positive driving enga-gement between the gear and the extensiblemember whereby the innerY extensible member 45 may be axially moved with respect to the outer member. The peg 59 and the lower surface of the lifting head 63 '(or a peg similar to peg'59 set in the groove of the threads 47 at adjacent the upper end of the .member 45) provide means for limiting the relative movement of the inner extensible member 45 with respect tothe outer I member 49.

The lconstruction. and arrangement of the friction device provides .a maximum amount of friction in a construction of extreme simplicity and specially adapted to economic production, it being apparent that the collar 65 may be stamped from sheet metal and that springs 65 may be made from common spring stock by cutting off therefrom considerable lengths and bending the same to the desired shape. No accurate-machining of the parts is necessary7 no auxiliary housings are necessary, and the construction is of such .simplicity as to be well'adapted for embodiment in a commercial article.

It is thought that'the invention and many 0f its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without depart-ing from the spirit and scope of the invention or sacrificing any of its material advantages, the form herein described being merely a preferred embodiment thereof.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

l. In an extension device, a frame, a lifting member arranged in said frame, an operating `f member rotatably mounted in said frame and having threaded connection with said 'extensible member whereby the extensible member may be axially moved with respect to said frame upon rotation of said operating member, means for rotating saidoperating member, and a frictional device carried by said extensible member and engaging said frame whereby to prevent relative rotation of said extensible member with respect to the frame, saidfrictionaldevice having a collar loosely mounted ron and embracing said extensible member and a spring device carried bysaid collar and frictionally 'engaging said extensible member for preventing relative movement between the collar and the extensible member.

2. In an extension device, a grooved frame, a lifting member arranged in said frame, an operating member rotatably mounted in said frame and having threaded connection with said extensible member whereby the extensible member may be axially moved with respect to said frame upon rotation of said operatingmember, means for rotating said operatino' member, and a frictional device carried bly said extensible member and ongaging said frame whereby to prevent rela-- tive rotation of said extensible member with respect to the frame, said frictional device having a collar yloosely mounted on and embracing said extensible member and a spring device carried by said collar and friotionally engaging said extensible member for preventing relative movement between the collar and the extensible member, said collar having a projecting ear adapted to engage the grooved portion of said frame.

y In an extension device, a grooved frame, a lifting member arranged in said frame for projection therefrom, an operating member slidably mounted in said frame and having threaded connection with said extensible memberwhereby the extensible member may be axially moved with respect to said frame upon rotation ofthe operating member, and a frictional device comprising a collar loosely mounted toand embracing said extensible member and having a` projecting ear adapted to engage the grooved portion ofthe frame, and friction means mounted to said collar and frictionally engaging said extensible member to prevent relative rotation therebetween.

4. A housing having a non-circular inner bore and having a rotatable driving member, a threaded sleeve projectable by the driving member, means comprising wire stock embracing the sleeve at the lower end, said means having portions interengaging with the non-circular portion ofthe bore to normally prevent rotation of the sleeve in the bore, Vand said means forming a yielding connection between the sleeve and the standard, whereby to permit the sleeve to rotate with the driving member.

5. A j ackcomprising a housing with a verf but yielding to permit tical groove and a rotatable driving member, a hollow threaded sleeve adapted to be projected by the driving member, a friction brake operable between the lower end of the sleeve and the housing and having an outstanding portion slidable in the vertical groove, whereby to normally prevent relative rotation of the sleeve in the housing, said brake comprising a resilient wire carried by said sleeve and having frict-ional engagement with one of said members to permit rotation of said sleeve with the driving member.

6. An automobile jack comprising a hollow, upstanding housing provided with a vertical groove, and a rotatable driving member, lifting means projectable by said driving member and including a threaded hollow sleeve, means for yieldingly holding the ier-ve from rotation relative to the housing, said sleeve to rotate with the driving member and relative to the housing, comprising means embracing the lower end of the sleeve operable between the housing and the hollow sleeve, and shiftable in and longitudinally of the groove inthe housing, said means including wire spring stool; adapted to yield with respect to one of sa`d members between which it operates to permit trie sleeve to rotate with the driving member.

7. A housing having a non-circular inner bore, a rotatable driving member, Aa threaded sleeve proj ectable thereby, means embracing the sleeve at the lower end, said means 'f having portions inter-engaging withthe non-ci 1cular portion of the bore, said means forming a yielding connection between the sleeve and the standard, whereby to permit relative rotation of the sleeve in the standard when at the limit of its movement.

8. A lifting jack comprising a hollowr standard, an exteriorally threaded outer screw member mounted in the standard, an inner screw member threaded in the outer screw member, means for elevating said screw members comprising an interiorally threaded Y rotatable collar engaging the threads of the outer screw member, means surrounding and carried by the lower end of the outer screw i member and in yielding frictional engagement with the outer screw member, said last named means having an end portion slidably guided in the standard for yieldingly resistV l ly urged to frictionally engage the lifting' screw and having keyed connection with the frame whereby to normally prevent relative rota-tion with respect to the frame while permitting the lifting screw to move longitudinally.

l0. ln an automobile jack a grooved frame forming a housing providing a vertical channel, a lifting member arranged in said channel for projection and retraction therefrom, an operating member comprising a collar threadingly engaging the outer surfaces of said lifting member, said collar being mounted in the frame at the upper end of the channel, means for rotating said collar and means normally preventing rotation of the lifting member with respect to the frame, said means including a member encircling the lifting member and having frictional engagement therewith and having a projection forming a splined non-rotative axially movable connection with the grooved portion of said frame and load engaging means carried by said lifting member.

ll. ln an automobile jack, a grooved frame forming a housing providing a vertical channel, a lifting member arranged in said channel for projection and retraction therefrom, an operating member comprising a collar threadingly engaging the outer surfaces of said lifting member, said collar being mounted in the frame at the upper end of the channel, means for rotating said collar and means normally preventing rotation of the lifting member with respect to the frame, but yielding to permit rotation of the lifting member when at the limits of its travel, said means including a member encircling the lifting member and having frictional engagement therewith and having a projection forming a splined non-rotative axially movable connection with the. grooved portion of said frame, and load engaging means carried by said extensible member, said lifting member being formed as a hollow sleeve provided withinternal screw threads and said load supporting member comprising a member threaded into the lifting member and having a load carrying head at its upper end.

In witness whereof, I have hereunto subscribed my name.

MILLARD B. LUCKER. 

